Keyword: monitoring
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MOP05 Fiber Bragg Grating Sensors as Beam-Induced Heating Monitor for the Central Beam Pipe of CMS simulation, radiation, experiment, hadron 28
  • F. Fienga, G. Breglio, A. Irace, V.R. Marrazzo, L. Sito
    University of Napoli Federico II, Napoli, Italy
  • N. Beni, G. Breglio, S. Buontempo, F. Carra, F. Fienga, F. Giordano, V.R. Marrazzo, B. Salvant, L. Sito, Z. Szillasi
    CERN, Meyrin, Switzerland
  • N. Beni, Z. Szillasi
    Atomki, Debrecen, Hungary
  • S. Buontempo
    INFN-Napoli, Napoli, Italy
  The passage of a high-intensity particle beam inside accelerator components generates heating, potentially leading to degradation of the accelerator performance or damage to the component itself. It is therefore essential to monitor such beam-induced heating in accelerators. This paper showcases the capabilities of iPipe, which is a set of Fiber Bragg Grating sensors stuck on the inner beam pipe of the Compact Muon Solenoid (CMS) experiment installed in the CERN Large Hadron Collider (LHC). In this study, the wavelength shift, linked directly to the temperature shift, is measured and is compared with the computed dissipated power for a set of LHC fills. Electromagnetic and thermal simulations were also coupled to predict the beam-induced temperature increase along the beam pipe. These results further validate the sensing system and the methods used to design accelerator components to mitigate beam-induced heating.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP05  
About • Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 September 2022
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MOP29 Low Gain Avalanche Detector Application for Beam Monitoring linac, detector, operation, electron 109
  • V. Kedych, T. Galatyuk, W. Krüger
    TU Darmstadt, Darmstadt, Germany
  • T. Galatyuk, S. Linev, J. Pietraszko, C.J. Schmidt, M. Träger, M. Traxler, F. Ulrich-Pur
    GSI, Darmstadt, Germany
  • J. Michel
    Goethe Universität Frankfurt, Frankfurt am Main, Germany
  • A. Rost
    FAIR, Darmstadt, Germany
  • V. Svintozelskyi
    Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
  Funding: This work has been supported by DFG under GRK 2128
The S-DALINAC is a superconductive linear electron accelerator operating at 3 GHz and allows operation in energy recovery mode (ERL). For the operation in the ERL mode accelerated and decelerated beams travel inside the same beamline but not necessarily share the same orbit. That leads to a bunch rate of 6 GHz. Non-destructive monitoring tools that allow optimization of acceleration and deceleration processes and achieve high recovery efficiency are important for operation in the ERL mode. The Low Gain Avalanche Detector (LGAD) is a silicon detector with internal gain layer optimized for 4-D tracking with timing resolution below 50 ps* which makes it a promising candidate for beam time structure monitoring. In this contribution we present the status of the first proof of principle beam time structure measurement with LGAD sensors at S-DALINAC in normal operation mode together with future activities overview.
* J.Pietraszko, et al., Low Gain Avalanche Detectors for the HADES reaction time (T0) detector upgrade, Eur. Phys. J. A 56, 183 (2020)
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-MOP29  
About • Received ※ 06 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 13 September 2022 — Issue date ※ 16 October 2022
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TUP02 Design of High Dynamic Range Preamplifiers for a Diamond-Based Radiation Monitor System controls, FPGA, radiation, detector 216
  • M. Marich, S. Carrato
    University of Trieste, Trieste, Italy
  • L. Bosisio, A. Gabrielli, Y. Jin, L. Lanceri
    INFN-Trieste, Trieste, Italy
  • G. Brajnik, G. Cautero, D. Giuressi
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • L. Vitale
    Università degli Studi di Trieste, Trieste, Italy
  Regardless of the different accelerator types (light sources like FELs or synchrotrons, high energy colliders), diagnostics is an essential element for both personnel and machine protection. With each update, accelerators become more complex and require an appropriate diagnostic system capable of satisfying multiple specifications, that become more stringent as complexity increases. This paper presents prototyping work towards a possible update of the readout electronics of a system based on single-crystal chemical vapor deposition (scCVD) diamond sensors, monitoring the radiation dose-rates in the interaction region of SuperKEKB, an asymmetric-energy electron-positron collider. The present readout units digitize the output signals from the radiation monitors, process them using an FPGA, and alert the accelerator control system if the radiation reaches excessive levels. The proposed updated version introduces a new design for the analog front end that overcomes its predecessor’s limits in dynamic range thanks to high-speed switches to introduce a variable gain in transimpedance preamplifiers, controlled by an ad-hoc developed FPGA firmware.  
poster icon Poster TUP02 [1.292 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP02  
About • Received ※ 07 September 2022 — Revised ※ 09 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 16 October 2022
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TUP03 The Beam Loss Monitoring System after the LHC Long Shutdown 2 at CERN electron, electronics, operation, detector 220
  • M. Saccani, E. Effinger, W. Viganò, C. Zamantzas
    CERN, Meyrin, Switzerland
  Most of the LHC systems at CERN were updated during the Long Shutdown 2, from December 2018 to July 2022, to prepare the accelerator for High-Luminosity. The Beam Loss Monitoring system is a key part of the LHC’s instrumentation for machine protection and beam optimisation by producing continuous and reliable measurements of beam losses along the accelerator. The BLM system update during LS2 aims at providing better gateware portability to future evolutions, improving significantly the data rate in the back-end processing and the software efficiency, and adding remote command capability for the tunnel electronics. This paper first recalls the Run 1 and Run 2 BLM system achievements, then reviews the main changes brought during LS2, before focusing on the commissioning phase of Run 3 and future expectations.  
poster icon Poster TUP03 [2.871 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP03  
About • Received ※ 05 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 12 September 2022 — Issue date ※ 29 October 2022
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TUP32 Differential Current Transformer for Beam Charge Monitoring in Noisy Environments electron, linac, pick-up, laser 304
  • H. Maesaka, T. Inagaki
    RIKEN SPring-8 Center, Hyogo, Japan
  • H. Dewa, T. Inagaki, H. Maesaka, K. Yanagida
    JASRI, Hyogo, Japan
  • K. Ueshima
    QST, Sendai, Miyagi, Japan
  We developed a differential current transformer (CT) for electron beam charge measurement in noisy environments, such as near high-power pulse sources. This CT has four pickup wires coiled at equal intervals (90 deg.) on a toroidal core and each coil is wound for two turns. The midpoint of the coil is connected to the body ground so that a balanced differential signal is generated at both ends. A beam pipe with a ceramics insulation gap is inserted into the toroidal core to obtain a signal from a charged-particle beam. The four pairs of signals are transmitted through a CAT6 differential cable and fed into differential amplifiers. The common-mode noise from the noisy ground at the CT is canceled out by the amplifier. The four signals are then summed and digitized by an AD converter. We produced differential CTs and installed them into the new injector linac of NewSUBARU (*). Before the installation, the frequency response was measured in a laboratory and a flat response of up to 100 MHz was obtained as expected. Common-mode noise cancellation was also confirmed at NewSUBARU and the CTs have been utilized for beam charge monitoring stably.
*: T. Inagaki et al., ’Construction of a Compact Electron Injector Using a Gridded RF Thermionic Gun and a C-Band Accelerator’, in Proc. IPAC’21, pp. 2687-2689. doi:10.18429/JACoW-IPAC2021-WEPAB039
poster icon Poster TUP32 [1.393 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP32  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 26 October 2022
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